Improve `prebid` redirect — legacy prebid.js versions support

[stanislav-atr]

There are websites that use old versions of prebid.js, these differ much from newer versions and are not supported by current redirect:

https://github.com/AdguardTeam/AdguardFilters/issues/25221 v1.23.0: https://www.epochtimes.com.tw/n265531?fbclid=IwAR1_I9H8vZ-uzdtNU2jbxLbVtls1aPDcT535T8wuYlrV5D0jmCB149

Improve prebid.js redirect to work with legacy versions.